Prong for vacuum tubes



R. S. RUSSELL PRONG FOR `VACUUM TUBES Filed Jan. 7, 19325 April 23, 1935.

ATTORNEY Patented Apr. 23, 1935 n PATENT OFFICE ,11,998,525 PnoNo Fon VACUUM TUBES n y Robert S. RusselLBayonne, N. J. f y Application January 7, 1939, serial No. 650,652

LThisini'lention relates f vacuum tubes. n

f The object of the invention is the production of improved prongs for a vacuum tube, by means to improved .prongs for .l of which resistance may be easily provided to properly. bias the vacuum tube, to control the voltage' and current supply and to provide means for properly lay-passing or blocking certain frequencies.

, The second objectof the invention is the pro` i duction of prongs with resistance members to avoid the necessity of locating Vthe resistances in the kapparatus for which they are used.

The kthird objectof the invention is the posif tioning of resistance in the chamber ofthe base of a vacuum tube, to avoid the necessity of locatingfsaid resistance in the apparatus for which it is used. o n

The fourth object of the invention is the placing of inductance, capacity, a transformer, and a choke coil in the chamber of the base of a vacuum tube.

The fifth object of the invention is'the production of prongs comprising two or more members, to make proper contact for biasing resistance, ,for by-passing resistance, for blocking a vacuum tube, for providing proper resistance, and for coacting with inductance, capacity, transformers, choke coils and resistances. f

Fig. 1 represents a vertical section of the vacu um tube with its elements diagrammatically indicated therein and an exempliiication of one of the improved forked shaped prongs of the invention; Fig. 2 rshows a side elevation of one of the improved prongs;y Fig. 3 is a top View of Fig. 2; Fig. 4 indicates a section of Fig. 2 on the line 4, 4 with additional appurtenances indicated diagrammatically; Fig. 5 shows an elevation of another form of theV improved prong; Fig. 6 indicates aright hand side view of Fig. 5; Fig. '1 reprosents a top View of Fig. 5 with an additional appartenance; Fig. 3 is a section on the line 8, 8 of Fig. 5; Fig. 9 representsa section ofFig. 5 on the line 9, 9 with some additional appurtenances; Fig. 10 shows an elevation of another form of prong; Fig. 11 indicates a left hand view of Fig. 10; Fig. l2 is a top view of Fig. 10; Fig. 13 shows a section of Fig. 10 on the line I3, I3 with additional appurtenances; Fig. 14 indicates a bottom View of a socket for the prongs of the tube; Fig. k15 is an enlarged section of Fig. 14 on the line I5, I5; Fig. 16 is a View similar to Fig. l5 withra modification; Fig. 1'1 represents a sectional elevation of the vacuum tube with a modification of the invention; Fig.-18y represents a sectional elevation of a fragmentary portion of the tube with another modification of the invention; Fig. 19 shows an enlarged' section of`Fig. 17 on the line I9, I9 andFig. 20 indicates a section of Fig. 18 on the line 20, 20. 5

Referring particularly .to Fig. 1 the vacuum tube is indicated with vthe bulb 20, the press 2l and the base` 22 withv its chamber 23 and the bottom wall 24. In'the bulb 20 is diagrammatically indicated' the'grid 3,0 suspended from the 10 top jof the bulb, theplate` 3I, the screen grid 32, the filament 33 Vand the` cathode 34. T'he prongs are indicated in their entireties by the numerals 40, 4I, 42, 43 and 44. l

A wire 41 connects the plate 3| and the prong 15V 40, A wire 48 connects the yscreen grid 32 and the prong 44. Wires 49 and 50 connect the filament 33 and the prongs .42 and 43. The wire 5I connects the cathode 34 yand the prong 4I. The prongs indicated in Fig. 1 are shown extending a considerable distance intothe chamber 23 to obtain a maximum length of resistance material for the prongs if soldesired to bias or to by-pass certain frequencies, to. control they current or control the voltage rof the elements. If less resistance is required the prongs can be made of a length to just extendvthrough the Vbottom wall 24 of the base 22. One or a plurality of the elements of the tube` may be biased, by-passed or have. the voltage or current controlled as required,.by the resistance of the improved prongs.

Referring particularly to FigsALl, 2, 3 and 4 and the prong 44. ,The said prong isV fork shaped and comprises the` longitudinal member 55 of resistance material with the top end 56 having the flat end face 51; Vand the longitudinal member VIll of prong or conducting material having the top end 6I with the flat end face 62. The faces 51 and 62 are soldered to each other. In the space between longitudinal members 55 and 60 is positioned the longitudinal bar 65 of electricy insulating material. The prong 44 having one resistance member can be used with any of the elements of the tube.

Referring to Figs. `5 to 9, the prong comprises two resistance members andr two members of prong. material. A longitudinal resistance member is indicated at 10, with the top end 1I having the flat end face 12. A longitudinal member of electric conducting material is indicated at 15 with the top end 16 having the flat end face 11. The faces 12 and 11 are soldered to each other.

, At the lower' end of theniember 15 is indicated at its bottom portion the flat end face 8|. The faces 10 and 8| are soldered to each other. At the top portion of the member is indicated the top end 83 having the dat end face 84. A member 85 of prong material having the top end 89 is shown with the Iiat end face 81. The flat end faces 81 and 84 are soldered to each other. In the spaces between the members 10, 15, 39 and 85 is positioned the cross shaped 1ongitudinal bar of insulating material 99. The prong just described which has two resistances can be used for any of the elements of the tube if desired.

Referring to Figs. 10, 11, 12 and 13, the improved prong comprises two resistance members and one prong material member. The prong-is forked shaped and is shown to consist of the longitudinal member 95 of electric resistance material, having the top end 96 with the fiat end 91. A second longitudinal member 98 of electric resistance material is indicated with the fiat end 99. A longitudinal member of prong material is shown at |00. The at end 91 at the top of the prong is soldered to the member |99 and the flat end 99 of the member 98 is soldered to the member |00 at its bottom end. A longitudinal bar of electric insulating material is indicated having the members |05 and |06. The member |05 is positioned between the members 95 and 98 and the member |08 is positioned between the members 95 and |00.

Referring tc Figs. 14 and 15 the socket for the tube is indicated with the plate having the usual members ||2 and ||3. A plurality of openings H5, HE, H1, H8, and H9, in this instance five, are indicated extending through the members H2 and |13 of the plate.

Referring to Fig. l5, the opening I8 has coacting therewith four contact brackets |20, each comprising the supporting member |22 with the foot |23 and the contact arm |24 with the contact end |25. The prong indicated in Figs. 5 to 9 is inserted through the opening ||8 and the lower ends of the member 10, 15, 80 and 85, contact with the contact ends |25. The openingr i1 has coacting therewith three contact brackets for a prong as indicated in Figs. 10 to 13. The Contact ends i 25 of these brackets bear against and contact with the lower ends of the members 03 and |00. The opening ||6 has coacting therewith two contact brackets for a prong as indicated in Figs. 2 to 4. The contact ends |25 of the brackets in this case bear against and contact with the lower ends of the members 55 and 20. rIhe openings ||5 and H9 have each coacting therewith a prong consisting only of prong material as indicated at 40, 4|, 42 and 43. The contact end |25 of each bracket bears against and contacts with the lower end of each of the prongs in the latter case. Any of the openings as 5 to H9 may be provided with one or a plurality of the contact brackets |20 to coact with any of the prongs of the tube as desired.

Referring to Fig. 16, the plate of the socket is again indicated with the members ||2 and H3. A pair of contact brackets are indicated at |200., and each comprises the supporting member I2?. with the foot |23 and the horizontal contact arm 124er. Each contact arm |24a has integral therewith the contact end |25a. It will be noted that the contact ends |2541 are at the upper portions of the contact brackets |20a, while the contact ends |25 of the contact brackets |20 are located a-t the lower portions thereof.

Referring to Figs. 17 and 19, the bulb of the tube is again shown at 20, the press at 2|, the base at 22 with the chamber 23 and the bottom wall 24. The prongs are indicated at 40a, 4|a, 42a, 43a and 44a. 'I'he wire 48 leads to one o! the elements in the bulb 20 and has connected thereto the resistance |30, which in turn is connected to the member 55a of prong material of the prong 44a. A Wire |32 connects one end. of the resistance |30 and the member 60a of prong material of the prong 44a. 'I'he members 55a and 60a, have interposed between them the bar 65a of electric insulating material. The said bar interlocks with the said members 55a and 80a.

Referring to Figs. 18 and 20, the bulb is again shown at 20, the press at 2|, the base at 22 with the chamber 23 and the bottom wall 24. The prongs are indicated at |40, |4I, |42, |43,and |44. The wire 48 leads from a grid in the bulb 20 and has connected thereto the resistances |35 and |36, which have interposed between them a short wire |31 of electric conducting material. The upper end of the resistance |35 is connected to the member |50 of prong material of the prong |44 by the wire |49. 'I'he lower end of the member |50 is connected to the blocking condenser |5I. A wire |55 leads from the short wire |31 to the upper end of the member I 56 of prong material of the prong |44. The lower end of the resistance |36 is connected to the upper end of the third member |58 of the prong |44. 'I'he members |50, |55 and |58 ofthe prong |44 have interposed between them the Y shaped bar |60 of electric insulating material which is interlocked with the members of said prong |44.

Referring to Fig. 18 the prong |40 comprises four members of prong material one of which is indicated at |10. Two of the members are connected to each other at their top ends |1| by solder. An inductance is shown at |12.

The lower end oi' one o1' the members |10 is connected to the aerial |15. A second member |10 is connected to a tuning condenser |18. From the top ends of the latter members |10 extend the wires |18 and |19, which connect with the inductance |12. From the wire |18 extends the wire i8! which leads to any element of the tube desired. The inductance is connected to a pair of the members |10 at their top ends by the wires |83. The latter members of the prong are grounded as shown at |84.

The prongs |4|, |42 comprises each four members of prong material insulated from each other.

A capacity is shown in the chamber 23 which comprises in this instance a plurality of condensers |90. Each of the condensers is connected by a wire with one of the members of the prong. One of the said wires is connected to the wire |92, that in turn leads to any element desired in the tube. The wires at the lower end 0I the prong |42 lead to an inductance, and one of the members of the prong is grounded as shown at |96.

A transformer is shown at 200, the lower ends of which are connected to the members o! the prong |42. Two wires 203 extend from a pair of the members of the prong and lead to the power supply. Two wires 204 lead from a. pair of the members of the prong to the filament of a tube, or the Wires 204 can be connected to a, nia.- ment in the base 22.

The prong |43 comprises a pair oi.' members of prong material separated from each other by insulating material. A choke coil is shown at 2|0, the lower ends of which are connected to the members of the prong |43. A wire 2|2 at the lower end of one of the members of the prong |43 leads to the plate or grid of the tube, and a wire 2 3 leads to the power or to the other end of a grid connection. The upper end of the choke coil 2|0 is connected by the wire 2|5 to an element of the tube.

Referring to Figs. 1, 2, 3 and 4 with the prong 44, the current lead 225 from the power supply is connected to one of the contact brackets |20. The current enters the lower end of the member 55 of resistance material, and is led to the screen grid 32 through the wire 43. The lower end of the member 60 also contacts with a contact bracket |20. The latter is connected to one side of a by-pass condenser 220 and the other side of the latter is grounded as indicated at 22|.

Referring to Figs. 5, 6, 7, 8 and 9 which show a four part prong, the current is supplied to the lower end ofthe prong by the wire 224 which extends to one of the brackets |20. The current flows up through the resistance member 10 and then ilows down the member 15 of prong material. The undesirable frequencies pass through one of the brackets |20 to the by-pass condenser 225e, and then to the ground 226.

The current flows from the lower end of the member 15 of prong material to the member 30 of resistance material. The upper end of the member 80 is connected to an element in the vacuum tube by the wire 228. The upper end of the member 80 is connected to the upper end of the memvber 85. The lower end of the member 35 is connected by means of one of the brackets |20 to the wire 229 and the latter leads to a blocking f condenser not shown. The four part prong can tube. If the prong coacts with the plate 3|, the

wire 230 leads from the power supply to one of the brackets |20 as shown in Fig. 13. The current flows rup through ythe member 85 of resistance material and then down the member of prong material. The lower end of the member |00 contacts with its coacting bracket |20. The latter is connected to one side of a by-pass condenser 23|.

The other side of the condenser 23| is grounded as shown at 232. They lower end of the member |00 being connected to the lower end of themember 98 of electric resistance material, the current will flow up the said member 98 which latter is connected to the plate 3| by means of the wire 41.

Referring to Figs. 17 and 19 the wire 43 is supposed to lead to the cathode 34. The current flows through the wire 48 to the upper end of the resistance |30, which is connected to the upper 'end of the member 55.1l of the prong 44a. The lower end of the member 55a contacts with one of the brackets |20, not shown, and is grounded as shown at 233. The upper end of the resistance |30 is connected to the wire |32 which leads to the upper end of the prong memrber 60a. The lower end of the member 60a contacts with a, contact bracket |20 not shown. 'I'he latter bracket is connected to one side of a bypass condenser 234, and the other side of the con-r denser 234 is grounded at 235. Attention is called to the fact that the prong 44a comprises a pair of members of prong material to adapt it for use with the resistance |30 located in the chamber 23.

Referring to Fig. 18 and particularly to the prong member |40, the inductance |12 is shown in the chamber 23 and is thereby eliminated from the body of the radio for simplicity and compactness. The capacity comprising the plurality of condensers |30, is placed in the chamber 23 also for simplicity and compactness. The choke coil 2|0 and the resistances |35 and |36 are also placed in thechamber 23 for simplicity and compactness.

Attention is called to the fact that all the prongs may be reversed when positioned in the chamber 23 of the base 22 to coact with the contact brackets 20a shown in Fig. 16.

It will be noted that with the stocket indicated in Figs. 14 and 15, contact with the prongs is `made at the lower portions thereof, while with the socket shown in Fig. 16 contact with the prongs is made at their upper portions, to permit contact with either ends of the prongs as desired.

Various modii'lcations may be made in the invention and the present exemplication is to be taken as illustrative and not limitative thereof.

Having described my invention I claim:

1. A prong for a vacuum tube, comprising a member of electric conducting material and a member of electric resistance material, said members connected to each other at one end and a bar of electric insulating material interposed between said members.

2. A prong for a vacuum tube comprising a pair of members of electric resistance material and a pair of members of electric conducting material, the upper end of one resistance member connected to the upper yend of one conducting member, the lower end of said last member connected to the lower end of the second resistance member the upper end of said last memberr connected to the upper end of the fourth member and electric insulating material interposed between the members of the prong.

3. In a prong for a vacuum tube the combination of a member of electric conducting material and a pair of members of electric resistance material, the upper end. of the member of electric conducting material connected to the upper end of one of the members of electric resistance materialr and the lower end of said member of electric conducting material connected to the lower end of the other member of resistance material and electric insulating material interposed between said members.`

4. In a prong for a vacuum tube the combination of a, plurality of members of electric insulating material, a plurality of members of electric conducting material and a plurality of members of electric resistance material.

, ROBERT S. RUSSELL. 

